diff --git a/cobaya/collection.py b/cobaya/collection.py
index 400c0053..4d717a94 100644
--- a/cobaya/collection.py
+++ b/cobaya/collection.py
@@ -496,11 +496,11 @@ def _check_logps(self, temperature_only=False, extra_tolerance=False):
             temperature = compute_temperature(
                 -self["minuslogpost"], -self["minuslogprior"], -self["chi2"] * 0.5,
                 check=True, extra_tolerance=extra_tolerance)
-        except AssertionError:
+        except AssertionError as excpt:
             raise LoggedError(
                 self.log, "The sample seems to have an inconsistent temperature.  "
                           "This could be due to input file truncation on the last line "
-                          "due to crash/being killed before complete.")
+                          "due to crash/being killed before complete.") from excpt
         if not temperature_only:
             tols = {
                 "rtol": 1e-4 * (10 if extra_tolerance else 1),
diff --git a/cobaya/tools.py b/cobaya/tools.py
index 8c4887e0..d15839ab 100644
--- a/cobaya/tools.py
+++ b/cobaya/tools.py
@@ -506,17 +506,17 @@ def load_DataFrame(file_name, skip=0, root_file_name=None):
             inp, sep=" ", header=None, names=cols, comment="#", skipinitialspace=True,
             skiprows=skip, index_col=False)
 
-        if not data.empty:
-            # Check if the last row contains any NaNs
-            if data.iloc[-1].isna().any():
-                log.warning("Last row of %s is incomplete or contains NaNs", file_name)
-                # If the second-to-last row exists and doesn't contain NaNs,
-                # delete the last row assuming this was due to crash on write
-                if len(data) > 1 and not data.iloc[-2].isna().any():
-                    data = data.iloc[:-1]
-                    log.info(f"Saving {file_name} deleting last (in)complete line")
-                    truncate_to_end_line(file_name)
-        return data
+    if not data.empty:
+        # Check if the last row contains any NaNs
+        if data.iloc[-1].isna().any():
+            log.warning("Last row of %s is incomplete or contains NaNs", file_name)
+            # If the second-to-last row exists and doesn't contain NaNs,
+            # delete the last row assuming this was due to crash on write
+            if len(data) > 1 and not data.iloc[-2].isna().any():
+                data = data.iloc[:-1]
+                log.info(f"Saving {file_name} deleting last (in)complete line")
+                truncate_to_end_line(file_name)
+    return data
 
 
 def prepare_comment(comment):